The roll stability control system, within ESC, auto-
matically reduces engine power, applies the engine
brake, and/or applies the tractor and trailer brakes
when the acceleration sensor detects that the vehicle
is at risk of rolling over.
ESC also has the capability of complete directional
stability (yaw control) in oversteer and understeer
conditions to reduce the likelihood of drift-out or jack-
knife. The system determines where the driver is at-
tempting to steer the vehicle and how much brake
demand is required in order to more precisely control
the vehicle in an emergency situation.
ESC works by constantly comparing the driver’s in-
tention with the vehicle’s actual behavior. The system
does this by monitoring systems such as wheel
speed, steering angle, yaw rate, lateral acceleration,
throttle position, and brake application. A central mi-
crocomputer analyzes the collected data and triggers
a response to keep the vehicle on course when an
unstable condition is detected.
When the system detects that the vehicle is at risk of
oversteering or understeering, it applies individual
tractor wheel end brakes and trailer brakes, activates
the engine retarder (if equipped), and/or cuts engine
power, depending on the severity. As a result, the
driver has full control over the vehicle until the sys-
tem detects a potential risk and intervenes accord-
ingly. ESC operates automatically; the driver does
not monitor or activate the system.
The dash indicator light illuminates whenever the roll
stability control system intervenes.
OnGuardACTIVE
™
Collision
Mitigation System
WABCO OnGuardACTIVE CMS is a forward-looking
radar-based safety system. The system includes for-
ward collision warning, adaptive cruise control (ACC),
and collision mitigation.
OnGuard equipped vehicles have antilock brakes
(ABS) and automatic traction control (ATC), and ei-
ther roll stability control (RSC) or electronic stability
control (ESC). These systems work together to en-
hance control of the vehicle. Depending on the situa-
tion, any of these features may apply throttle control,
engine brakes, and/or service brakes, as needed.
The front-looking antenna assembly transmits radar
signals to, and receives them back from, objects
ahead of the vehicle. To be detected, vehicles must
be within the radar field of view and provide a sur-
face area that can reflect the radar. The distance,
speed, and angle of the vehicle ahead is calculated,
and the driver is warned of potentially dangerous
situations. The system also warns of stationary ob-
jects to alert the driver of potential obstructions
ahead in their lane.
WARNING
The WABCO OnGuardACTIVE
™
Collision Mitiga-
tion System is intended solely as an aid for an
alert and conscientious professional driver. It is
not intended to be relied upon to operate a ve-
hicle. Use the system in conjunction with rear-
view mirrors and other instruments to safely op-
erate the vehicle. Operate a vehicle equipped
with OnGuardACTIVE in the same safe manner as
if the CMS were not present.
The OnGuardACTIVE Collision Safety System is
not a substitute for safe, normal driving proce-
dures, nor will it compensate for any driver im-
pairment such as drugs, alcohol, or fatigue.
Failure to drive safely and use the system prop-
erly could result in personal injury and/or death
and severe property damage.
System Limitations
The OnGuardACTIVE Collision Mitigation System
may provide little or no warning of hazards such as
pedestrians, animals, oncoming vehicles, or cross
traffic.
The OnGuardACTIVE CMS only brakes for lead ve-
hicles located directly in front of your vehicle, and
does not operate when vehicle speed is less than 15
mph (25 km/h).
Due to these limitations, the system:
•
will not react and alert the operator to objects
crossing in front of the vehicle or oncoming
traffic;
f611337a06/16/2016
Fig. 7.24, ATC/Stability Indicator Lamp
Driver Assistance Features
7.20
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